Process and apparatus for cooling cement-kiln gases and the recovery of



L. STEVENS. PROCESS AND APPARATUS FOR COOLING CEMENT KILN GASES AND THE RECOVERY OF DUST THEREFROM.

APPLICATION FILED DEC.29. 1915-- 1 3 1 5,254 Patented Sept. 9, 1919.

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PROCESS AND APPARATUS FOR 000mm CEMENT KILN GASES AND THE RECOVERY OF DUST THEREFROM.

APPLICATION FILED 050.29, 1915.

1,31 5,25%. Patented Sept. 9, 1919.

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I NI ED STATES PATENT OFFICE.

LEVI STEVENS, OF ALPENA, MICHIGAN.

PROCESS AND APPARATUS FOR COOLING CEMENT-KILN GASES AND THE RECOVERY OF DUST THEBEFROM.

To all whom it may concern: I Be it known that I, LEVI STEVENS, a citi- -.zen of the United States, residing at Alpena,

in the county of Alpena and State of Michigan, have invented certain newand useful Improvementsin Processes of and Apparatus for Cooling Cement-Kiln Gases and the Recovery of Dust Therefrom, of which the following is a specification.

This invention relates to the process of and apparatus for the recovery of material in the form of dust carried by the products of combustion and other gases from cement kilns. I a

The objects of my invention are to reduce the temperature of the ases from cement kilns sufficiently to permit them to behandled by exhaust fans and dust-separators, to recover the dust and suspended matter ina physically dry condition suitable for im mediate or future use, and to discharge the products of combustion and other ases from a cement kiln combined with tie cooling agents practically free from suspended matter.

In the accompanying drawings:

Figure 1 is a vertical longitudinal section through the rear end of a cement kiln, housing and stack, showing air ports, spraypipes, exhaust fan and connections to dustse arators.

1g. 2 1s a plan looking downward upon Fig. 1, showing general location of apparatus and'connections.

Fig. 3 isa partial side view of the gas-receiving chamber, showing location of air ports and spray-pipes. i

Fig. 4 is a section on lines B B Fi 1, showing arrangement of spray-pipesi fiiiln stack.

In Fig. 1, the cement kiln 1, is supplied with powdered cement making material from feed 2, in the usual manner. The products of combustion, and other gases carrying dust and suspended particles of raw cement making material pass from the cementkiln into housing or chamber 3, wherein they are commingled with a regulated supply of atmospherie air, which has been brought to a desirable point of saturation by water jets 5, injected into the gases by suitably located air ports, jets, or equivalent means 4- 4, 4, atmospheric air also being commingled with the gases by bein drawn through doors'G, 6, 6, as hereinafter escribed.

Specification of Letters Patent. Patented Sept. 9, 1919.

Application filed December 29, 1915. Serial No. 69,212.

The partially cooledkiln gases combined with atmospheric air and water vapor are drawn from housing 3, by stack 7, where the rapidly ascending gases are sprayed with a regulated quantity ,of water by suitably located spray-pipes 8,,(Figs. 1 and 4.)

The kiln gases, atmospheric air and water vapors are drawn from stack 7, by exhaust fan 10, through connecting pipe' 9. As shown in Fig. 2, the pipe 9 has its exit arranged tangentially to the stack 7 so that the gases while within the stack are given a 1'0- her 3, but may also cause a current of atmospheric air to descend the stack 7. This additional current of cooling atmospheric air may, if desired, be brought to any desirable point of saturation, by injecting a regulated quantity of water through the spray pipes 11, as may be required by the varying kiln conditions.

As this current of cool or saturated atmospheric air is traveling in an opposite direction to the rapidly ascending current of kiln gases, these opposing streams meet at connection 9, and are combined and thoroughly mixed by the rotary ,or whirling motion imparted to the gases by the tangentially located connection 9, which perfects the cooling of the kiln gases so thatthey may be safely handled by exhaust fan 10.

The exhaust fan 10, placed between stack 7, and the dust separators, acts as a mechanical mixing chamber in which anyparticles of water not converted into steam will be brought into intimate contact with the gases and converted into steam by the heat of such gases; and as it is operated by a variable speed motor, any desired amount of draft may be had to draw cooling streams of atmospheric air downward through the stack 7, or through openings 6, 6, i'nhousing struction, which controls the amount of wateiwapplied to cool the kiln gases by spray-pipes 5, 8, and 11. The thermostat,

by any suitable levfcr system, herein diagrammatically shown by one lever 15, controls valve 16 in the main water supply-pipe 17, this valve being opened as the heat of the gases increases and closing as the heat of the gases decreases,the regulation being so adjusted that the amount of water applied to cool therkiln gases will all be converted into steam and ass off, as such, through the stack 18 of t e dust-separator.

The cooled dust-laden gases drawn from stack 7, by exhaust fan 10, are passed to dust-separators 14, 19, and 20, three separators beingshown, although one or more may be used as found necessary. In these dustseparators, the dust and particles of cementmaking material are separated \from the cooled products of combustion, gases, and steam produced b cooling sprays, in a physically dry con ition suitable for immediate or future use, the products of combustion, gases, and steam, produced by the cooling sprays, passing off through stack- 18.

I claim 1. The process of treating cement kiln gases carrying suspended matter which con' slsts in commingling therewith upon their exit from thekiln, a supply of air in quantities sufficient to cool said gases to a temperature at which they can behandled by an exhaust fan and passing the cooled gases from such fan through a dust separator.

53. The process of treating cement-kiln gases carrying suspended matter, which con- 'sists'in' commingling therewith a regulated supply of water-saturated atmospheric air m'quantity sufficient to cool said gases and leave the suspended matter physically dry,

passingthe cooled gases through a dust-sen arator, and precipitating the sus ended matter from sald gases in a physica ly dry condition.

3. The process of treating cement-kiln gases carrying suspended matter, which consists in commingling therewith, immediately on their exit from the kiln, a regulated supply of water-saturated air, further comminglin the gases with a current of cool air, passing the cooled gases through a dust separator, and matter from said condition.

4. The process of treating cement-kiln gases carrying suspended matter, which consists in comminglin therewith, immediately on their exit from t e kiln, a regulated supplyof water-saturated air, further commingling the gases with a current of waterprecipitating .the suspended gases in a physically dry saturated cool air, passing the cooled gases through a dust-separator, and precipitating the suspended matter from said gasesin a physically dry condition.

5.- An apparatus for treating cement kiln gases consisting ofa conduit comprising a chamber which surrounds the delivery end of the kiln; a fan connected to said conduit; adust separator connected to said fan and means for introducing cooling fluid into said conduit in quantities suflicient to cool said gases.

6. An apparatus for treatingceinent kiln gases-consisting of a conduit comprising a.

chamber, which surrounds the delivery end of the kiln, and an open ended stack; a fan connected to said conduit; a dust separator connected to said fan and means for introducing cooling 'fiuid into said conduit in quantities suflicient to cool said gases.

7.. An apparatus for treating cement gases comprising a chamber for receiving such gases, an open-topped stack connected thereto, means for introducing air and water thereinto, and a fan connected to said stack and to a dust-separating system. 7

In testimon whereof afiix my signature in presence 0 two witnesses.

. LEVI STEVENS;

Witnesses:

FRANK JERMIN,

R. 0. WEST.. 

